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Predicting Young’s modulus of Indian coal measure rock using multiple regression and artificial neutral network

Chakraborty Sayantan, Bisai Rohan, Roy Rohit, Palaniappan Sathish Kumar, Pal Samir Kumar, Rao Karanam Uma Maheshwar

Journal of Sustainable Mining

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2023

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Vol. 22, iss. 1

41--54

EN

Accurate information on Young’s modulus (E) is required for simulating rock deformation in mines; on the other hand, it is very cumbersome to obtain in the laboratory and collecting drilled cores in sufficient amounts, especially in the case of soft rocks, is quite impossible. Empirical equations were deducted for - from easily determinable rock properties, and the final model was selected through different statistical strength parameter tests. The generalization of the equation was verified through the normal distribution tests of residues of the equation. R2 came to be 0.609 and was validated using an artificial neural network with an improved value of 0.73.

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Influence of cutting parameters on the performance of plough during hard rock cutting in coal mining

Palaniappan Sathish Kumar, Chinnasamy Moganapriya, Pal Samir Kumar, Rathanasamy Rajasekar

Journal of Sustainable Mining

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2023

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Vol. 22. iss. 3

185--194

EN

Coal ploughs have proved very successful on many faces in various parts of the world. Recently, there has been a general tendency in longwall working to increase the speed at which the machine progresses along the coal face. An increase in production rate demands enhances either due to depth of penetration or cutting speed. This, in turn, results in increasing power demand and also the force acting on an individual pick. To get maximum efficiency from a cutting machine, a number of parameters need to be investigated. The first and foremost thing of interest is naturally the pick geometry. The cutting force can be expected to depend mainly on the rack angle and clearance angle of the tool. The second parameter is the cutting depth, which when enhanced, increases the rate of advancement and, at the same time, results in enhanced cutting force. This results in large power demand and increases wear of picks. Thirdly, cutting speed, in which higher cutting speed will increase the production rate but at the same time is expected to enhance the power demand and the cutting force. This paper aims at investigating the cutting efficiency of the plough by simulating the coal cutting operation in the laboratory. The effect of three main parameters like pick geometry, cutting depth, and cutting speed, on cutting efficiency have been studied in detail. The cutting force elevates at a faster rate with an increase in depth at higher speeds. The percentage increase in force is nearly 20% for a speed increase of 20%.

3

Influence of Dual Filler Reinforcement on the Curing and Tribo-Mechanical Behaviour of Natural Rubber Nanocomposite for Tire Tread Application

Harikrishna Kumar M., Subramaniam Shankar, Rajasekar Rathanasamy, Pal Samir Kumar, Palaniappan Sathish Kumar

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 3

893--899

EN

A huge amount of carbon black (40-60 phr) was commonly used as a reinforcing material in manufacturing of tires to improve the technical properties of pure rubber. Carbon black causes severe health hazard like skin cancer, respiratory problem due to its fly loss property. This study focusses on reducing the usage of carbon black by replacing it with minimal quantity of nanoclay to compensate the technical properties of rubber. Natural rubber nanocomposite are fabricated using solution and mechanical mixing method in presence and absence of compatibilizer. Cure characteristics, wear test and mechanical properties were examined. NR nanocomposite with dual filler in presence of compatibilizer showed enhancement in torque values, mechanical and wear resistant property. Wear resistance, tensile strength and modulus of dual filler nanocomposite was increased by 66.7%, 91% and 85% when compared to pure NR. Hence NR nanocomposite with dual filler in presence of compatibilizer was found as a proving and possible nanocomposite for tire application.

4

Experimental analysis on the technical behavior of carbon black filled rubber blends’ rollers for rice husk removal application

Paramasivam Prabhakaran, Ranganathan Rajesh, Rathanasamy Rajasekar, Kaliyannan Gobinath Velu, Palaniappan Sathish Kumar, Pal Samir Kumar, Chinnasamy Moganapriya

Polimery

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2019

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T. 64, nr 1

50--55

EN

In rice husk removal processes, the rubber rollers are used to produce white rice kernels. Paddies are fed between two rubber rollers and the removal of husk takes place due to high friction generated between the paddy layer and outer surface of rubber rollers. Husk removal application involves rubber compounds with promising physico-mechanical properties. Small scale rice mills in Tamil Nadu, India face problems in periodic replacement of rubber rollers due to poor service life. Based on thesurvey, it was found that the rubber compounds with high hardness lead to efficient husk removal and at the same time cause break age of rice. Employing soft rubber eliminates the breakage of rice, but on the other hand the sharp corners of paddy damage the rubber. This research work focuses on the development of rubber compounds for effective rice husk removal application. Carbon black filled, pure and blends of natural rubber (NR), acrylonitrile butadiene rubber (NBR), and epoxidized natural rubber (ENR) are developed. Mechanical properties and lab scale rice husk separation studies are conducted for the developed rubber compounds. The ENR-NBR blends prove to be suitable materials for husk removal application.

PL

Usunięcie łusek z ziaren ryżu metodą walcowania pomiędzy rolkami wykonanymi z kauczuku napełnionego sadzą następuje w wyniku tarcia wytwarzanego między warstwą nasion ryżu a powierzchnią rolek. Do tego typu zastosowań potrzebne są mieszanki kauczukowe o specjalnych właściwościach fizyko-mechanicznych. Ze względu na niewielką trwałość dotychczas stosowanych materiałów gumowych, małe młyny ryżu w Tamil Nadu w Indiach borykają się z koniecznością okresowej ich wymiany. Na podstawie przeprowadzonych badań stwierdzono, że rolki wykonane z mieszanek kauczukowych o dużej twardości skutecznie usuwają łuski, ale niestety powodują jednocześnie pękanie ziaren ryżu. Z kolei zastosowanie mieszanek kauczukowych o mniejszej twardości ogranicza zjawisko pękania, ale ostre łuski uszkadzają rolki. Zbadano właściwości mechaniczne i efektywność w procesie separacji łuski ryżowej napełnionych sadzą wulkanizatów kauczuku naturalnego (NR), butadienowo-akrylonitrylowego (NBR), epoksydowanego kauczuku naturalnego (ENR) lub ich mieszanin. Wulkanizaty mieszaniny ENR-NBR okazały się najbardziej odpowiednimi materiałami na rolki do zastosowań w procesie usuwania łuski ryżowej.